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On this IT-SecurityBlog we cover topics like security, network security, Docker and co.

In progress

Security Onion” series of articles | Hardening of mail systems series of articles | Sense and purpose of SPF.

``The only secure system would have to be turned off, in a sealed room encased in reinforced concrete and surrounded by armed protection troops.``

Security expert Gene Spafford was obviously right. The NSA scandal has made it clear that there can be no absolute security for electronic data – neither from access by Internet criminals nor from government espionage activities.